TOTAL CROSS-SECTIONS FOR ELECTRON-SCATTERING ON NO2, OCS, SO2 AT INTERMEDIATE ENERGIES

Total cross sections for electron scattering on SO2, NO2, OCS have bee n measured in the energy range from 90 to 4000 eV. Our data extrapolat ed to low energies match other experiments on OCS and NO2; for SO2 dis crepancies amount to as much as 20%. The experimental values for these gases and for CO2 (the latter measured previously in our laboratory) have hen fitted with a Born-like formula. Two parameters are sufficien t to reproduce the SO2, NO2 and CO2 cross sections from 20 to 4000 eV within the experimental errors. A double Yukawa potential with four pa rameters is needed to reproduce the OCS cross sections over the same e nergy interval.